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SquirrelMail G/PGP plugin: Arbitrary code execution


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200708-08 / squirrelmail
Release Date August 11, 2007
Latest Revision August 11, 2007: 01
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
mail-client/squirrelmail < 1.4.10a-r2 >= 1.4.10a-r2 All supported architectures

Related bugreports: #185010


Multiple vulnerabilities have been discovered in SquirrelMail, allowing for the remote execution of arbitrary code.

2.  Impact Information


SquirrelMail is a webmail package written in PHP. It supports IMAP and SMTP protocols.


The functions deletekey(), gpg_check_sign_pgp_mime() and gpg_recv_key() used in the SquirrelMail G/PGP encryption plugin do not properly escape user-supplied data.


An authenticated user could use the plugin to execute arbitrary code on the server, or a remote attacker could send a specially crafted e-mail to a SquirrelMail user, possibly leading to the execution of arbitrary code with the privileges of the user running the underlying web server. Note that the G/PGP plugin is disabled by default.

3.  Resolution Information


Enter the SquirrelMail configuration directory (/usr/share/webapps/squirrelmail/version/htdocs/config), then execute the script. Select the plugins menu, then select the gpg plugin item number in the "Installed Plugins" list to disable it. Press S to save your changes, then Q to quit.


All SquirrelMail users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-client/squirrelmail-1.4.10a-r2"

4.  References


Page updated August 11, 2007

Summary: This is a Gentoo Linux Security Advisory

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